Sign holder



FIG. 1 is a top perspective view of a sign holder, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a bottom perspective view thereof; and,

FIG. 9 is a top perspective view of a sign holder shown in an environment of use.

The broken lines in FIG. 9 show environment and form no part of the claimed design. 

CLAIM The ornamental design for a sign holder, as shown and described. 